| quote | Originally posted by maryjane: The other thing to remember is that IF the engine is running and IF your oil pressure switch is good, the fuel pump can/will be powered thru the OP switch even if the fuel pump relay fails. But, a major bad connection at battery or at a fusible kink or at the battery junction can prevent the fp from recieving any power. |
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Many engine swap installs removed the OP Switch or wiring to it for F-pump. So you never get fuel running after long cranking like many OE Engine Setups.
Worse,
If this swap was wire w/ OP Switch same as OE setup... @ minimum the OP Switch in the OP-Sender is fried to carrying the 2 fans + F-pump amps too
Can be OP-Sender and Plug has "melted" even tho OP-gauge still works.
Many car relays and some switches are 20a
but only Resistive load @ best ~ 10a for motors and other Inductive loads.
OE F-pump relay is one of them and safely handle F-pump but not extra 2 fans even small "radiator type" fans likely used here.
The fans by themselves may "over load" 1 OE relay too.
IOW F-pump and other using same OE relay that have Heavy contacts then most others and may take a bit more DC power thru them. But you will start to burn the contacts cause contact resistance causing more burning and kill them fast when near or at the Inductive limit. Most Relay/Switches are 1/4 to 1/3 Inductive Load rated vs. X Amps "printed" on them. If you read a Data Sheet for a relay or switch that say nothing about Inductive Loads common to knockoffs parts then Do Not use whatever to control motors.